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This is a great little solar charger for all those tiny button batteries that are so expensive. Charges Ni-Cd, Alkaline, Zinc Air, Mercury and Ni-MH button cells that are 1.2 - 1.5 volts. In 3-5 hours of direct sun your battery will be charged and ready for use. Includes suction cup so you can hang it in any sunny window. Charges one battery at a time, simply put the battery under the alligator clip on back. Red LED tells you it's working! One of our customers charged her hearing aid batteries 14 times! She went from spending $25 per month to spending less than $4.00 per month! If you use button batteries for your hearing aid or other small device, this charger will save you $$$ ! Measures approx. 1.5" X 2.5". Made in the USA.